Pavement sealing composition and method of application

ABSTRACT

A pavement sealing composition and method of application of the sealant to pavement to form a thin coating which protects the pavement, particularly asphalt from the harmful effects of oxidation, water, ice and snow as well as fluids spilled onto the pavement surface from automobiles and aircraft. Preferably, the coating is formed of a combination of materials including a polymer resin, fine sand and Portland cement. To this combination, a defoaming agent is added along with a preservative, pigment, a quick drying agent and water. This formulation provides for a thin protective layer which can be returned to service in a short period of time.

FIELD OF THE INVENTION

[0001] The present invention relates to pavement coating compositionsand methods of application of the composition to pavement.

BACKGROUND OF THE INVENTION

[0002] A very large industry has existed for many years in the U.S.referred to as “The Asphalt Sealing Industry”. This industry's primaryfunction is to apply a protective sealant such as a coal tar sealant tonew and old asphalt surfaces to retard oxidation and further to protectthe asphalt surface from the damaging effects of fluids as water andthose emitted from an automobile. Oxidation causes severe deteriorationin asphalt surfaces, if the surface is left unprotected. In those partsof the U.S. experiencing ice and snow, unprotected asphalt can and oftenwill be severely damaged by the melting snow and ice. Further damage iscaused to unprotected asphalt by substances such as salt employed toaccelerate melting of snow and ice. Automotive fluids such as brakefluid, oil, gasoline, diesel fuel etc. leaking from automobiles alsohave a significant adverse effect on the longevity of unprotectedasphalt surfaces. Automotive fluids of the type identified above alongwith the oxidation process cause unprotected asphalt to ravel and potholes to form. The Asphalt sealing industry emerged in large part toovercome the undesirable deterioration of unprotected asphalt. Sealantcontractors in this industry have for many years contracted with variousindividuals and businesses to apply coal tar sealants to asphaltsurfaces to prevent deterioration. Coal tar sealants are generallyeffective but there are a number of disadvantages attendant theirapplication and use. For example, the application of a coal tar sealantby spray equipment allows particles to become airborne and therebysoiling workers, buildings and numerous other animate and inanimateobjects. Coal tar sealants also have a significant tracking problem.This is due in large part to the prolonged curing period attendant sprayapplication of the coal tar sealant. The tracking problem isparticularly troublesome for restaurant and/or fast food proprietorsbecause the sealant is tracked into the establishment. Anotherdisadvantage attendant coal tar sealants is the very strong odor. Thisundesirable odor compounds the tracking problem in that not only is theestablishment soiled by the material but the odor as well. Anotherimportant concern is the breathing of hydrocarbon vapors by workersapplying the coal tar sealant. Long-term exposure to these airbornehydrocarbons may have serious health effects on the workers.

[0003] In an effort to overcome these disadvantages to coal tarsealants, attempts have been made to use other materials such asconcrete to seal pavement surfaces such as parking lots. However, thinlayers of concrete without polymer modification are subject tobrittleness which allows an unacceptable amount of chipping and crackingand has an unacceptable time for curing prior to being put back in toservice. Even prior formulations of polymer modified concrete areunacceptable in situations, which demand a quick return to service, suchas some roads and airports.

[0004] Therefore, it can be seen that there is a need for a polymermodified concrete formulation which overcomes the disadvantages of coaltar sealants and provides a quick return to service so that the pavementcan be put back into use soon after the application of the sealant.Additional objects and advantages of the invention will become apparentupon reading of the detailed description of the invention in conjunctionwith the accompanying drawings.

OBJECTS AND SUMMARY OF THE INVENTION

[0005] It is an object of the invention to provide a pavement sealingcomposition which dries quickly so that the pavement can be returned toservice soon after application of the sealant.

[0006] Another object of the invention is to provide a pavement sealingcomposition that can be mixed on site and applied to pavement.

[0007] Yet another object of the invention is a pavement sealingcomposition that can be colored and mixed on site and applied topavement.

[0008] Yet another object of the invention is to provide a protectivelayer over asphalt pavement to prevent solar heating of the pavement.

[0009] Still another object of the invention is to provide a method ofapplying the pavement sealing composition in a thin layer.

[0010] These and other objects, uses and advantages will be apparentfrom a reading of the description which follows with reference to theaccompanying drawings forming a part thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

[0011]FIG. 1 is a fragmentary perspective view of the method of applyingthe pavement sealing composition over a pavement surface.

[0012]FIG. 2 is a fragmentary perspective view of the layer of pavementsealing composition in place over the pavement surface.

[0013] In summary, the invention is directed to a pavement sealingcomposition and method of application of the sealant to pavement to forma thin coating which protects the pavement, particularly asphalt fromthe harmful effects of oxidation, water, ice and snow as well as fluidsspilled onto the pavement surface from automobiles and aircraft.Preferably, the coating is formed of a combination of materialsincluding a polymer resin, fine sand and Portland cement. To thiscombination, a defoaming agent is added along with a preservative,pigment, a quick drying agent and water. This formulation provides for athin protective layer which can be returned to service in a short periodof time.

DETAILED DESCRIPTION OF THE INVENTION

[0014] This invention is primarily directed to the sealing of asphalt onairport tarmacs, parking lots and driveways. The sealant compositionpermits a very thin layer to be applied to pavement surfaces such asasphalt which when dry forms a hard and durable coating which adheres tothe pavement surface and provides a high friction surface. It is anadvantage of the invention to seal asphalt pavement with a light coloredlayer to prevent heating of the asphalt and thereby preventing ruttingof the asphalt by vehicle traffic which frequently occurs when thetemperature of the asphalt pavement rises on hot, sunny summer days.

[0015] The preferred formulation of the sealant includes a resin mixtureincluding Rohm and Haas E330 liquid polymer resin to which is added 1.5pounds of FoamBlast Defoamer by Rosschem per 100 pounds and 2.2 poundsof Nuosept preservative by Mozel per 100 pounds. These components aremixed prior to arrival at the job site. The powder portion of thecomposition is formed of 1 part QUIKRETE® fast setting cement and 2parts 80 to 100 mesh silica sand (washed). The use of fine sand is veryimportant in the sealant composition. The fine sand permits the sealantto be applied as a thin layer. QUIKRETE® fast setting cement includes asetup accelerator such as sodium carbonate which speeds up the settingand drying time. The powder portion of the composition is alsopreferably premixed prior to arrival at the job site.

[0016] To provide a pigmented sealant, coloring pigment may be added toeither the powder or the resin. For example, 0.5 pounds of black powderpigment manufactured by Davis Colors, Inc. #860 may be added to thepremixed powder to provide a black sealant. Also, KB97 liquid blackpigment distributed by Eagle Sales, Inc. may be added to the resinmixture to provide a black sealant. Alternatively, black pigment may beadded to both the powder mixture and the resin to provide an ultra blacksurface which is desirable at some airports to increase contrast fromthe air and make the runways easier to see for incoming aircraft. Ironoxide may be added to give the sealant a red coloring. Titanium dioxidemay be used as a white coloring agent. DCC-1112 Lead Free Yellow byAzalea Color Co. may be added for a yellow coloring.

[0017] At the job site, the resin mixture is combined with the powder atthe rate of one gallon of resin mixture to one 60 pound bag of premixedpowder and ½ to ¾ gallon of water.

[0018] Now referring to FIGS. 1 and 2, the sealant composition 10 isapplied to the pavement surface 12 by pouring the sealant compositiononto the pavement surface 12 and quickly spreading the sealantcomposition 10 using a squeegee 14 to form a layer 16 of approximately{fraction (1/64)} of an inch to {fraction (1/32)} of an inch inthickness. It is important that the layer 16 be thin to achieve quickdrying and avoid wasting of material. The sealant composition will dryin 10 to 30 minutes in 70 degrees Fahrenheit and above air and groundtemperatures at this thickness and will harden to provide a durable sealover the pavement surface 12 and permit the pavement surface to be putback into service. In spreading the sealant, it is important that thesqueegee 14 or trowel (not shown) not pass over the sealant composition10 more than two times as this tends to bring the liquid to the surfacethus separating the polymer resin from the sand and cement.

[0019] While this invention has been described as having a preferreddesign, it is understood that it is capable of further modifications,uses and/or adaptations of the invention following in general theprinciple of the invention and including such departures from thepresent disclosure as come within the known or customary practice in theart to which the invention pertains and as maybe applied to the centralfeatures hereinbefore set forth, and fall within the scope of theinvention and the limits of the appended claims.

What is claimed is:
 1. A polymer modified concrete composition forapplication to pavement surfaces, comprising: a) a mixture of polymerresin and a defoaming agent and a preservative blended with a powdermixture of cement and 80 to 100 mesh silica sand and sodium carbonate.2. The composition as set forth in claim 1 further including: a) water.3. The composition as set forth in claim 1 further including: a)pigment.
 4. A polymer modified concrete sealant layer on an asphaltsurface comprising: a) a mixture of polymer resin and a defoaming agentand a preservative blended with a powder mixture of cement and 80 to 100mesh silica sand and sodium carbonate.
 5. The layer as set forth inclaim 4, wherein the mixture further includes: a) water.
 6. The layer asset forth in claim 4, wherein the mixture further includes: a) pigment.7. The layer as set forth in claim 4, wherein: a) said sealant layer isof a thickness of approximately between {fraction (1/64)} of an inch and{fraction (1/32)} of an inch in thickness.
 8. The layer as set forth inclaim 7, wherein: a) said mixture dries in 10 to 30 minutes afterapplication.
 9. A method of applying a polymer modified concretecomposition onto a pavement surface comprising the steps of: a) pouringpolymer modified concrete onto a pavement surface; b) spreading saidpolymer modified concrete into a layer of approximately {fraction(1/32)} of an inch in thickness.
 10. The method of applying a polymermodified concrete composition onto a pavement surface as set forth inclaim 9, wherein: a) the polymer modified concrete composition is formedof a mixture of polymer resin and a defoaming agent and a preservativeblended with a powder mixture of cement and 80 to 100 mesh silica sandand sodium carbonate and water.
 11. The method of applying a polymermodified concrete composition onto a pavement surface as set forth inclaim 10, wherein: a) said composition is applied using a squeegee,wherein said squeegee passes over said composition not more than twotimes to prevent separation of said sand and said resin.